code: def test_str_accessor_getitem(df_ddf):
      df, ddf = df_ddf
      assert_eq(ddf.str_col.str[:2], df.str_col.str[:2])
      assert_eq(ddf.str_col.str[1], df.str_col.str[1])
  
imports: from __future__ import annotations
  import contextlib
  import numpy
  import pytest
  import dask.dataframe
  from dask.dataframe._compat import PANDAS_GE_140, PANDAS_GE_210
  from dask.dataframe._pyarrow import to_pyarrow_string
  from dask.dataframe.utils import assert_eq, pyarrow_strings_enabled
label_desc: Use image node_id 9 for calling a global function with example usage: test_str_accessor_getitem(df_ddf) without return types